Replacing rear brake pads on 2007 Lexus IS250

I've replaced the rear pads. the wheels ae very hard to spin by hand. Feels like there is a drag as it free rolls. Pads are very hot on the test ride. did i miss something?

Asked by for the 2007 Lexus IS250
May have defective calipers, as old pads wore the caliper pistons moved outward toward the disc, pushing the pistons back inward may have the pistons operating in an area of the caliper where it partially seizes. Are the caliper slide pins free, try cleaning and lubricating them.